It would be worth getting the battery checked out. I think most fast fit centre offer a free battery test if you don't have a multimeter to do the checks yourself.
On one of my previous batteries whatever it is that is green had simply been moved out of place and a shake of the battery saw it return to the viewing window. Worth a go.
On one of my previous batteries whatever it is that is green had simply been moved out of place and a shake of the battery saw it return to the viewing window. Worth a go.